Metatrader 4 script meaning

HI all,
I saw this Elliott wave metatrader 4 indicator at https://www.best-metatrader-indicato...et-oscillator/.
I could not understand the meaning of the script for the 2 moving average line.
Could the expert here help me to understand this ** 2 MA calculation** scripts meaning (how they do this calculation) ?
how they derive the value and why they do it this way ?
Thank you in advance

//---===================
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,ExtMapBuffer2); // <<------ this is top MA line
SetIndexStyle(2,DRAW_LINE);
SetIndexBuffer(2,ExtMapBuffer3); // <<------ this is bottom MA line
//---===================

under line 70, what is the meaning of this line ?
double pr=2.0/(38+1);

https://www.best-metatrader-indicato...et-oscillator/

//---===================

pr = 0.05128205....



It's a nonsense line of code

NO. The value is used to plot the 2 Moving average trend line .. i was thinking is that is 20% of 'some value'(histogram ?)

Yeah, I know it is being used to print the trend line. I just trying to say that it is a nonsense calculation. Why having to calculate the same value on every tick? It can be set on a global variable: pr = 0.05128205....